Replying to United States vaccine restrictions

Yo guys! Planning a trip that includes New York and Colorado in December this year. I’m just wanting to get an idea of what the situation is like over there with respect to being vaccinated, mainly to do with what airlines, accommodation places and resorts are requiring? No fights please. I’ve had 2 Pfizer doses but don’t want a third as I had quite a bad reaction to the second, and I have had covid now so would rather not get a third. Are any airlines or places in either NY or CO requiring a third?